npm and error messages

node_modules/webpack-dev-server/lib/util/addDevServerEntrypoints.js

@@ -0,0 +1,40 @@
+'use strict';
+
+/* eslint no-param-reassign: 'off' */
+
+const createDomain = require('./createDomain');
+
+module.exports = function addDevServerEntrypoints(webpackOptions, devServerOptions, listeningApp) {
+  if (devServerOptions.inline !== false) {
+    // we're stubbing the app in this method as it's static and doesn't require
+    // a listeningApp to be supplied. createDomain requires an app with the
+    // address() signature.
+    const app = listeningApp || {
+      address() {
+        return { port: devServerOptions.port };
+      }
+    };
+    const domain = createDomain(devServerOptions, app);
+    const devClient = [`${require.resolve('../../client/')}?${domain}`];
+
+    if (devServerOptions.hotOnly) { devClient.push('webpack/hot/only-dev-server'); } else if (devServerOptions.hot) { devClient.push('webpack/hot/dev-server'); }
+
+    const prependDevClient = (entry) => {
+      if (typeof entry === 'function') {
+        return () => Promise.resolve(entry()).then(prependDevClient);
+      }
+      if (typeof entry === 'object' && !Array.isArray(entry)) {
+        const entryClone = {};
+        Object.keys(entry).forEach((key) => {
+          entryClone[key] = devClient.concat(entry[key]);
+        });
+        return entryClone;
+      }
+      return devClient.concat(entry);
+    };
+
+    [].concat(webpackOptions).forEach((wpOpt) => {
+      wpOpt.entry = prependDevClient(wpOpt.entry);
+    });
+  }
+};

node_modules/webpack-dev-server/lib/util/createDomain.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const url = require('url');
+const internalIp = require('internal-ip');
+
+
+module.exports = function createDomain(options, listeningApp) {
+  const protocol = options.https ? 'https' : 'http';
+  const appPort = listeningApp ? listeningApp.address().port : 0;
+  const port = options.socket ? 0 : appPort;
+  const hostname = options.useLocalIp ? internalIp.v4() : options.host;
+
+  // use explicitly defined public url (prefix with protocol if not explicitly given)
+  if (options.public) {
+    return /^[a-zA-Z]+:\/\//.test(options.public) ? `${options.public}` : `${protocol}://${options.public}`;
+  }
+  // the formatted domain (url without path) of the webpack server
+  return url.format({
+    protocol,
+    hostname,
+    port
+  });
+};